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Diffstat (limited to 'include/iprt/cpp/xml.h')
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1 files changed, 1109 insertions, 0 deletions
diff --git a/include/iprt/cpp/xml.h b/include/iprt/cpp/xml.h new file mode 100644 index 00000000..79e319aa --- /dev/null +++ b/include/iprt/cpp/xml.h @@ -0,0 +1,1109 @@ +/** @file + * IPRT - XML Helper APIs. + */ + +/* + * Copyright (C) 2007-2019 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + */ + +#ifndef IPRT_INCLUDED_cpp_xml_h +#define IPRT_INCLUDED_cpp_xml_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#ifndef IN_RING3 +# error "There are no XML APIs available in Ring-0 Context!" +#endif + +#include <iprt/list.h> +#include <iprt/cpp/exception.h> +#include <iprt/cpp/utils.h> + +#include <list> +#include <memory> + + +/** @defgroup grp_rt_cpp_xml C++ XML support + * @ingroup grp_rt_cpp + * @{ + */ + +/* Forwards */ +typedef struct _xmlParserInput xmlParserInput; +typedef xmlParserInput *xmlParserInputPtr; +typedef struct _xmlParserCtxt xmlParserCtxt; +typedef xmlParserCtxt *xmlParserCtxtPtr; +typedef struct _xmlError xmlError; +typedef xmlError *xmlErrorPtr; + +typedef struct _xmlAttr xmlAttr; +typedef struct _xmlNode xmlNode; + +/** @} */ + +namespace xml +{ + +/** + * @addtogroup grp_rt_cpp_xml + * @{ + */ + +// Exceptions +////////////////////////////////////////////////////////////////////////////// + +class RT_DECL_CLASS LogicError : public RTCError +{ +public: + + LogicError(const char *aMsg = NULL) + : RTCError(aMsg) + {} + + LogicError(RT_SRC_POS_DECL); +}; + +class RT_DECL_CLASS RuntimeError : public RTCError +{ +public: + + RuntimeError(const char *aMsg = NULL) + : RTCError(aMsg) + {} +}; + +class RT_DECL_CLASS XmlError : public RuntimeError +{ +public: + XmlError(xmlErrorPtr aErr); + + static char* Format(xmlErrorPtr aErr); +}; + +// Logical errors +////////////////////////////////////////////////////////////////////////////// + +class RT_DECL_CLASS ENotImplemented : public LogicError +{ +public: + ENotImplemented(const char *aMsg = NULL) : LogicError(aMsg) {} + ENotImplemented(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {} +}; + +class RT_DECL_CLASS EInvalidArg : public LogicError +{ +public: + EInvalidArg(const char *aMsg = NULL) : LogicError(aMsg) {} + EInvalidArg(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {} +}; + +class RT_DECL_CLASS EDocumentNotEmpty : public LogicError +{ +public: + EDocumentNotEmpty(const char *aMsg = NULL) : LogicError(aMsg) {} + EDocumentNotEmpty(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {} +}; + +class RT_DECL_CLASS ENodeIsNotElement : public LogicError +{ +public: + ENodeIsNotElement(const char *aMsg = NULL) : LogicError(aMsg) {} + ENodeIsNotElement(RT_SRC_POS_DECL) : LogicError(RT_SRC_POS_ARGS) {} +}; + +// Runtime errors +////////////////////////////////////////////////////////////////////////////// + +class RT_DECL_CLASS EIPRTFailure : public RuntimeError +{ +public: + + EIPRTFailure(int aRC, const char *pcszContext, ...); + + int rc() const + { + return mRC; + } + +private: + int mRC; +}; + +/** + * The Stream class is a base class for I/O streams. + */ +class RT_DECL_CLASS Stream +{ +public: + + virtual ~Stream() {} + + virtual const char *uri() const = 0; + + /** + * Returns the current read/write position in the stream. The returned + * position is a zero-based byte offset from the beginning of the file. + * + * Throws ENotImplemented if this operation is not implemented for the + * given stream. + */ + virtual uint64_t pos() const = 0; + + /** + * Sets the current read/write position in the stream. + * + * @param aPos Zero-based byte offset from the beginning of the stream. + * + * Throws ENotImplemented if this operation is not implemented for the + * given stream. + */ + virtual void setPos (uint64_t aPos) = 0; +}; + +/** + * The Input class represents an input stream. + * + * This input stream is used to read the settings tree from. + * This is an abstract class that must be subclassed in order to fill it with + * useful functionality. + */ +class RT_DECL_CLASS Input : virtual public Stream +{ +public: + + /** + * Reads from the stream to the supplied buffer. + * + * @param aBuf Buffer to store read data to. + * @param aLen Buffer length. + * + * @return Number of bytes read. + */ + virtual int read (char *aBuf, int aLen) = 0; +}; + +/** + * + */ +class RT_DECL_CLASS Output : virtual public Stream +{ +public: + + /** + * Writes to the stream from the supplied buffer. + * + * @param aBuf Buffer to write data from. + * @param aLen Buffer length. + * + * @return Number of bytes written. + */ + virtual int write (const char *aBuf, int aLen) = 0; + + /** + * Truncates the stream from the current position and upto the end. + * The new file size will become exactly #pos() bytes. + * + * Throws ENotImplemented if this operation is not implemented for the + * given stream. + */ + virtual void truncate() = 0; +}; + + +////////////////////////////////////////////////////////////////////////////// + +/** + * The File class is a stream implementation that reads from and writes to + * regular files. + * + * The File class uses IPRT File API for file operations. Note that IPRT File + * API is not thread-safe. This means that if you pass the same RTFILE handle to + * different File instances that may be simultaneously used on different + * threads, you should care about serialization; otherwise you will get garbage + * when reading from or writing to such File instances. + */ +class RT_DECL_CLASS File : public Input, public Output +{ +public: + + /** + * Possible file access modes. + */ + enum Mode { Mode_Read, Mode_WriteCreate, Mode_Overwrite, Mode_ReadWrite }; + + /** + * Opens a file with the given name in the given mode. If @a aMode is Read + * or ReadWrite, the file must exist. If @a aMode is Write, the file must + * not exist. Otherwise, an EIPRTFailure excetion will be thrown. + * + * @param aMode File mode. + * @param aFileName File name. + * @param aFlushIt Whether to flush a writable file before closing it. + */ + File(Mode aMode, const char *aFileName, bool aFlushIt = false); + + /** + * Uses the given file handle to perform file operations. This file + * handle must be already open in necessary mode (read, or write, or mixed). + * + * The read/write position of the given handle will be reset to the + * beginning of the file on success. + * + * Note that the given file handle will not be automatically closed upon + * this object destruction. + * + * @note It you pass the same RTFILE handle to more than one File instance, + * please make sure you have provided serialization in case if these + * instasnces are to be simultaneously used by different threads. + * Otherwise you may get garbage when reading or writing. + * + * @param aHandle Open file handle. + * @param aFileName File name (for reference). + * @param aFlushIt Whether to flush a writable file before closing it. + */ + File(RTFILE aHandle, const char *aFileName = NULL, bool aFlushIt = false); + + /** + * Destroys the File object. If the object was created from a file name + * the corresponding file will be automatically closed. If the object was + * created from a file handle, it will remain open. + */ + virtual ~File(); + + const char *uri() const; + + uint64_t pos() const; + void setPos(uint64_t aPos); + + /** + * See Input::read(). If this method is called in wrong file mode, + * LogicError will be thrown. + */ + int read(char *aBuf, int aLen); + + /** + * See Output::write(). If this method is called in wrong file mode, + * LogicError will be thrown. + */ + int write(const char *aBuf, int aLen); + + /** + * See Output::truncate(). If this method is called in wrong file mode, + * LogicError will be thrown. + */ + void truncate(); + +private: + + /* Obscure class data */ + struct Data; + Data *m; + + /* auto_ptr data doesn't have proper copy semantics */ + DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(File); +}; + +/** + * The MemoryBuf class represents a stream implementation that reads from the + * memory buffer. + */ +class RT_DECL_CLASS MemoryBuf : public Input +{ +public: + + MemoryBuf (const char *aBuf, size_t aLen, const char *aURI = NULL); + + virtual ~MemoryBuf(); + + const char *uri() const; + + int read(char *aBuf, int aLen); + uint64_t pos() const; + void setPos(uint64_t aPos); + +private: + /* Obscure class data */ + struct Data; + Data *m; + + /* auto_ptr data doesn't have proper copy semantics */ + DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(MemoryBuf); +}; + + +/* + * GlobalLock + * + * + */ + +typedef xmlParserInput* FNEXTERNALENTITYLOADER(const char *aURI, + const char *aID, + xmlParserCtxt *aCtxt); +typedef FNEXTERNALENTITYLOADER *PFNEXTERNALENTITYLOADER; + +class RT_DECL_CLASS GlobalLock +{ +public: + GlobalLock(); + ~GlobalLock(); + + void setExternalEntityLoader(PFNEXTERNALENTITYLOADER pFunc); + + static xmlParserInput* callDefaultLoader(const char *aURI, + const char *aID, + xmlParserCtxt *aCtxt); + +private: + /* Obscure class data. */ + struct Data; + struct Data *m; +}; + +class ElementNode; +typedef std::list<const ElementNode*> ElementNodesList; + +class AttributeNode; + +class ContentNode; + +/** + * Node base class. + * + * Cannot be used directly, but ElementNode, ContentNode and AttributeNode + * derive from this. This does implement useful public methods though. + * + * + */ +class RT_DECL_CLASS Node +{ +public: + virtual ~Node(); + + const char *getName() const; + const char *getPrefix() const; + const char *getNamespaceURI() const; + bool nameEqualsNS(const char *pcszNamespace, const char *pcsz) const; + bool nameEquals(const char *pcsz) const + { + return nameEqualsNS(NULL, pcsz); + } + bool nameEqualsN(const char *pcsz, size_t cchMax, const char *pcszNamespace = NULL) const; + + const char *getValue() const; + bool copyValue(int32_t &i) const; + bool copyValue(uint32_t &i) const; + bool copyValue(int64_t &i) const; + bool copyValue(uint64_t &i) const; + + /** @name Introspection. + * @{ */ + /** Is this an ElementNode instance. + * @returns true / false */ + bool isElement() const + { + return m_Type == IsElement; + } + + /** Is this an ContentNode instance. + * @returns true / false */ + bool isContent() const + { + return m_Type == IsContent; + } + + /** Is this an AttributeNode instance. + * @returns true / false */ + bool isAttribute() const + { + return m_Type == IsElement; + } + + int getLineNumber() const; + /** @} */ + + /** @name General tree enumeration. + * + * Use the introspection methods isElement() and isContent() before doing static + * casting. Parents are always or ElementNode type, but siblings and children + * can be of both ContentNode and ElementNode types. + * + * @remarks Attribute node are in the attributes list, while both content and + * element nodes are in the list of children. See ElementNode. + * + * @remarks Careful mixing tree walking with node removal! + * @{ + */ + /** Get the parent node + * @returns Pointer to the parent node, or NULL if root. */ + const Node *getParent() const + { + return m_pParent; + } + + /** Get the previous sibling. + * @returns Pointer to the previous sibling node, NULL if first child. + */ + const Node *getPrevSibiling() const + { + if (!m_pParentListAnchor) + return NULL; + return RTListGetPrevCpp(m_pParentListAnchor, this, const Node, m_listEntry); + } + + /** Get the next sibling. + * @returns Pointer to the next sibling node, NULL if last child. */ + const Node *getNextSibiling() const + { + if (!m_pParentListAnchor) + return NULL; + return RTListGetNextCpp(m_pParentListAnchor, this, const Node, m_listEntry); + } + /** @} */ + +protected: + /** Node types. */ + typedef enum { IsElement, IsAttribute, IsContent } EnumType; + + /** The type of node this is an instance of. */ + EnumType m_Type; + /** The parent node (always an element), NULL if root. */ + Node *m_pParent; + + xmlNode *m_pLibNode; ///< != NULL if this is an element or content node + xmlAttr *m_pLibAttr; ///< != NULL if this is an attribute node + const char *m_pcszNamespacePrefix; ///< not always set + const char *m_pcszNamespaceHref; ///< full http:// spec + const char *m_pcszName; ///< element or attribute name, points either into pLibNode or pLibAttr; + ///< NULL if this is a content node + + /** Child list entry of this node. (List head m_pParent->m_children.) */ + RTLISTNODE m_listEntry; + /** Pointer to the parent list anchor. + * This allows us to use m_listEntry both for children and attributes. */ + PRTLISTANCHOR m_pParentListAnchor; + + // hide the default constructor so people use only our factory methods + Node(EnumType type, + Node *pParent, + PRTLISTANCHOR pListAnchor, + xmlNode *pLibNode, + xmlAttr *pLibAttr); + Node(const Node &x); // no copying + + friend class AttributeNode; + friend class ElementNode; /* C list hack. */ +}; + +/** + * Node subclass that represents an attribute of an element. + * + * For attributes, Node::getName() returns the attribute name, and Node::getValue() + * returns the attribute value, if any. + * + * Since the Node constructor is private, one can create new attribute nodes + * only through the following factory methods: + * + * -- ElementNode::setAttribute() + */ +class RT_DECL_CLASS AttributeNode : public Node +{ +public: + +protected: + // hide the default constructor so people use only our factory methods + AttributeNode(const ElementNode *pElmRoot, + Node *pParent, + PRTLISTANCHOR pListAnchor, + xmlAttr *pLibAttr); + AttributeNode(const AttributeNode &x); // no copying + + friend class Node; + friend class ElementNode; +}; + +/** + * Node subclass that represents an element. + * + * For elements, Node::getName() returns the element name, and Node::getValue() + * returns the text contents, if any. + * + * Since the Node constructor is private, one can create element nodes + * only through the following factory methods: + * + * -- Document::createRootElement() + * -- ElementNode::createChild() + */ +class RT_DECL_CLASS ElementNode : public Node +{ +public: + int getChildElements(ElementNodesList &children, const char *pcszMatch = NULL) const; + + const ElementNode *findChildElementNS(const char *pcszNamespace, const char *pcszMatch) const; + const ElementNode *findChildElement(const char *pcszMatch) const + { + return findChildElementNS(NULL, pcszMatch); + } + const ElementNode *findChildElementFromId(const char *pcszId) const; + + /** Finds the first decendant matching the name at the end of @a pcszPath and + * optionally namespace. + * + * @returns Pointer to the child string value, NULL if not found or no value. + * @param pcszPath The attribute name. Slashes can be used to make a + * simple path to any decendant. + * @param pcszNamespace The namespace to match, NULL (default) match any + * namespace. When using a path, this matches all + * elements along the way. + * @see findChildElement, findChildElementP + */ + const ElementNode *findChildElementP(const char *pcszPath, const char *pcszNamespace = NULL) const; + + /** Finds the first child with matching the give name and optionally namspace, + * returning its value. + * + * @returns Pointer to the child string value, NULL if not found or no value. + * @param pcszPath The attribute name. Slashes can be used to make a + * simple path to any decendant. + * @param pcszNamespace The namespace to match, NULL (default) match any + * namespace. When using a path, this matches all + * elements along the way. + * @see findChildElement, findChildElementP + */ + const char *findChildElementValueP(const char *pcszPath, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + if (pElem) + return pElem->getValue(); + return NULL; + } + + /** Combines findChildElementP and findAttributeValue. + * + * @returns Pointer to attribute string value, NULL if either the element or + * the attribute was not found. + * @param pcszPath The attribute name. Slashes can be used to make a + * simple path to any decendant. + * @param pcszAttribute The attribute name. + * @param pcszPathNamespace The namespace to match @a pcszPath with, NULL + * (default) match any namespace. When using a + * path, this matches all elements along the way. + * @param pcszAttributeNamespace The namespace prefix to apply to the + * attribute, NULL (default) match any namespace. + * @see findChildElementP and findAttributeValue + */ + const char *findChildElementAttributeValueP(const char *pcszPath, const char *pcszAttribute, + const char *pcszPathNamespace = NULL, + const char *pcszAttributeNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszPathNamespace); + if (pElem) + return pElem->findAttributeValue(pcszAttribute, pcszAttributeNamespace); + return NULL; + } + + + /** @name Tree enumeration. + * @{ */ + + /** Get the next tree element in a full tree enumeration. + * + * By starting with the root node, this can be used to enumerate the entire tree + * (or sub-tree if @a pElmRoot is used). + * + * @returns Pointer to the next element in the tree, NULL if we're done. + * @param pElmRoot The root of the tree we're enumerating. NULL if + * it's the entire tree. + */ + ElementNode const *getNextTreeElement(ElementNode const *pElmRoot = NULL) const; + RT_CPP_GETTER_UNCONST_RET(ElementNode *, ElementNode, getNextTreeElement, (const ElementNode *pElmRoot = NULL), (pElmRoot)) + + /** Get the first child node. + * @returns Pointer to the first child node, NULL if no children. */ + const Node *getFirstChild() const + { + return RTListGetFirstCpp(&m_children, const Node, m_listEntry); + } + RT_CPP_GETTER_UNCONST_RET(Node *, ElementNode, getFirstChild,(),()) + + /** Get the last child node. + * @returns Pointer to the last child node, NULL if no children. */ + const Node *getLastChild() const + { + return RTListGetLastCpp(&m_children, const Node, m_listEntry); + } + + /** Get the first child node. + * @returns Pointer to the first child node, NULL if no children. */ + const ElementNode *getFirstChildElement() const; + + /** Get the last child node. + * @returns Pointer to the last child node, NULL if no children. */ + const ElementNode *getLastChildElement() const; + + /** Get the previous sibling element. + * @returns Pointer to the previous sibling element, NULL if first child + * element. + * @see getNextSibilingElement, getPrevSibling + */ + const ElementNode *getPrevSibilingElement() const; + + /** Get the next sibling element. + * @returns Pointer to the next sibling element, NULL if last child element. + * @see getPrevSibilingElement, getNextSibling + */ + const ElementNode *getNextSibilingElement() const; + + /** Find the previous element matching the given name and namespace (optionally). + * @returns Pointer to the previous sibling element, NULL if first child + * element. + * @param pcszName The element name to match. + * @param pcszNamespace The namespace name, default is NULL which means + * anything goes. + * @note Changed the order of the arguments. + */ + const ElementNode *findPrevSibilingElement(const char *pcszName, const char *pcszNamespace = NULL) const; + + /** Find the next element matching the given name and namespace (optionally). + * @returns Pointer to the previous sibling element, NULL if first child + * element. + * @param pcszName The element name to match. + * @param pcszNamespace The namespace name, default is NULL which means + * anything goes. + * @note Changed the order of the arguments. + */ + const ElementNode *findNextSibilingElement(const char *pcszName, const char *pcszNamespace = NULL) const; + /** @} */ + + + const AttributeNode *findAttribute(const char *pcszMatch, const char *pcszNamespace = NULL) const; + /** Find the first attribute with the given name, returning its value string. + * @returns Pointer to the attribute string value. + * @param pcszName The attribute name. + * @param pcszNamespace The namespace name, default is NULL which means + * anything goes. + * @see getAttributeValue + */ + const char *findAttributeValue(const char *pcszName, const char *pcszNamespace = NULL) const + { + const AttributeNode *pAttr = findAttribute(pcszName, pcszNamespace); + if (pAttr) + return pAttr->getValue(); + return NULL; + } + + bool getAttributeValue(const char *pcszMatch, const char *&pcsz, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &pcsz, pcszNamespace); } + bool getAttributeValue(const char *pcszMatch, RTCString &str, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &str, pcszNamespace); } + bool getAttributeValuePath(const char *pcszMatch, RTCString &str, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &str, pcszNamespace); } + bool getAttributeValue(const char *pcszMatch, int32_t &i, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &i, pcszNamespace); } + bool getAttributeValue(const char *pcszMatch, uint32_t &i, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &i, pcszNamespace); } + bool getAttributeValue(const char *pcszMatch, int64_t &i, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &i, pcszNamespace); } + bool getAttributeValue(const char *pcszMatch, uint64_t &u, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &u, pcszNamespace); } + bool getAttributeValue(const char *pcszMatch, bool &f, const char *pcszNamespace = NULL) const + { return getAttributeValue(pcszMatch, &f, pcszNamespace); } + + /** @name Variants that for clarity does not use references for output params. + * @{ */ + bool getAttributeValue(const char *pcszMatch, const char **ppcsz, const char *pcszNamespace = NULL) const; + bool getAttributeValue(const char *pcszMatch, RTCString *pStr, const char *pcszNamespace = NULL) const; + bool getAttributeValuePath(const char *pcszMatch, RTCString *pStr, const char *pcszNamespace = NULL) const; + bool getAttributeValue(const char *pcszMatch, int32_t *pi, const char *pcszNamespace = NULL) const; + bool getAttributeValue(const char *pcszMatch, uint32_t *pu, const char *pcszNamespace = NULL) const; + bool getAttributeValue(const char *pcszMatch, int64_t *piValue, const char *pcszNamespace = NULL) const; + bool getAttributeValue(const char *pcszMatch, uint64_t *pu, const char *pcszNamespace = NULL) const; + bool getAttributeValue(const char *pcszMatch, bool *pf, const char *pcszNamespace = NULL) const; + /** @} */ + + /** @name Convenience methods for convering the element value. + * @{ */ + bool getElementValue(int32_t *piValue) const; + bool getElementValue(uint32_t *puValue) const; + bool getElementValue(int64_t *piValue) const; + bool getElementValue(uint64_t *puValue) const; + bool getElementValue(bool *pfValue) const; + /** @} */ + + /** @name Convenience findChildElementAttributeValueP and getElementValue. + * @{ */ + bool getChildElementValueP(const char *pcszPath, int32_t *piValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + return pElem && pElem->getElementValue(piValue); + } + bool getChildElementValueP(const char *pcszPath, uint32_t *puValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + return pElem && pElem->getElementValue(puValue); + } + bool getChildElementValueP(const char *pcszPath, int64_t *piValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + return pElem && pElem->getElementValue(piValue); + } + bool getChildElementValueP(const char *pcszPath, uint64_t *puValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + return pElem && pElem->getElementValue(puValue); + } + bool getChildElementValueP(const char *pcszPath, bool *pfValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + return pElem && pElem->getElementValue(pfValue); + } + + /** @} */ + + /** @name Convenience findChildElementAttributeValueP and getElementValue with a + * default value being return if the child element isn't present. + * + * @remarks These will return false on conversion errors. + * @{ */ + bool getChildElementValueDefP(const char *pcszPath, int32_t iDefault, int32_t *piValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + if (pElem) + return pElem->getElementValue(piValue); + *piValue = iDefault; + return true; + } + bool getChildElementValueDefP(const char *pcszPath, uint32_t uDefault, uint32_t *puValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + if (pElem) + return pElem->getElementValue(puValue); + *puValue = uDefault; + return true; + } + bool getChildElementValueDefP(const char *pcszPath, int64_t iDefault, int64_t *piValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + if (pElem) + return pElem->getElementValue(piValue); + *piValue = iDefault; + return true; + } + bool getChildElementValueDefP(const char *pcszPath, uint64_t uDefault, uint64_t *puValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + if (pElem) + return pElem->getElementValue(puValue); + *puValue = uDefault; + return true; + } + bool getChildElementValueDefP(const char *pcszPath, bool fDefault, bool *pfValue, const char *pcszNamespace = NULL) const + { + const ElementNode *pElem = findChildElementP(pcszPath, pcszNamespace); + if (pElem) + return pElem->getElementValue(pfValue); + *pfValue = fDefault; + return true; + } + /** @} */ + + ElementNode *createChild(const char *pcszElementName); + + ContentNode *addContent(const char *pcszContent); + ContentNode *addContent(const RTCString &strContent) + { + return addContent(strContent.c_str()); + } + + ContentNode *setContent(const char *pcszContent); + ContentNode *setContent(const RTCString &strContent) + { + return setContent(strContent.c_str()); + } + + AttributeNode *setAttribute(const char *pcszName, const char *pcszValue); + AttributeNode *setAttribute(const char *pcszName, const RTCString &strValue) + { + return setAttribute(pcszName, strValue.c_str()); + } + AttributeNode *setAttributePath(const char *pcszName, const RTCString &strValue); + AttributeNode *setAttribute(const char *pcszName, int32_t i); + AttributeNode *setAttribute(const char *pcszName, uint32_t i); + AttributeNode *setAttribute(const char *pcszName, int64_t i); + AttributeNode *setAttribute(const char *pcszName, uint64_t i); + AttributeNode *setAttributeHex(const char *pcszName, uint32_t i); + AttributeNode *setAttribute(const char *pcszName, bool f); + + virtual ~ElementNode(); + +protected: + // hide the default constructor so people use only our factory methods + ElementNode(const ElementNode *pElmRoot, Node *pParent, PRTLISTANCHOR pListAnchor, xmlNode *pLibNode); + ElementNode(const ElementNode &x); // no copying + + /** We keep a pointer to the root element for attribute namespace handling. */ + const ElementNode *m_pElmRoot; + + /** List of child elements and content nodes. */ + RTLISTANCHOR m_children; + /** List of attributes nodes. */ + RTLISTANCHOR m_attributes; + + static void buildChildren(ElementNode *pElmRoot); + + friend class Node; + friend class Document; + friend class XmlFileParser; +}; + +/** + * Node subclass that represents content (non-element text). + * + * Since the Node constructor is private, one can create new content nodes + * only through the following factory methods: + * + * -- ElementNode::addContent() + */ +class RT_DECL_CLASS ContentNode : public Node +{ +public: + +protected: + // hide the default constructor so people use only our factory methods + ContentNode(Node *pParent, PRTLISTANCHOR pListAnchor, xmlNode *pLibNode); + ContentNode(const ContentNode &x); // no copying + + friend class Node; + friend class ElementNode; +}; + + +/** + * Handy helper class with which one can loop through all or some children + * of a particular element. See NodesLoop::forAllNodes() for details. + */ +class RT_DECL_CLASS NodesLoop +{ +public: + NodesLoop(const ElementNode &node, const char *pcszMatch = NULL); + ~NodesLoop(); + const ElementNode* forAllNodes() const; + +private: + /* Obscure class data */ + struct Data; + Data *m; +}; + +/** + * The XML document class. An instance of this needs to be created by a user + * of the XML classes and then passed to + * + * -- XmlMemParser or XmlFileParser to read an XML document; those classes then + * fill the caller's Document with ElementNode, ContentNode and AttributeNode + * instances. The typical sequence then is: + * @code + Document doc; + XmlFileParser parser; + parser.read("file.xml", doc); + Element *pElmRoot = doc.getRootElement(); + @endcode + * + * -- XmlMemWriter or XmlFileWriter to write out an XML document after it has + * been created and filled. Example: + * + * @code + Document doc; + Element *pElmRoot = doc.createRootElement(); + // add children + xml::XmlFileWriter writer(doc); + writer.write("file.xml", true); + @endcode + */ +class RT_DECL_CLASS Document +{ +public: + Document(); + ~Document(); + + Document(const Document &x); + Document& operator=(const Document &x); + + const ElementNode* getRootElement() const; + ElementNode* getRootElement(); + + ElementNode* createRootElement(const char *pcszRootElementName, + const char *pcszComment = NULL); + +private: + friend class XmlMemParser; + friend class XmlFileParser; + friend class XmlMemWriter; + friend class XmlStringWriter; + friend class XmlFileWriter; + + void refreshInternals(); + + /* Obscure class data */ + struct Data; + Data *m; +}; + +/* + * XmlParserBase + * + */ + +class RT_DECL_CLASS XmlParserBase +{ +protected: + XmlParserBase(); + ~XmlParserBase(); + + xmlParserCtxtPtr m_ctxt; +}; + +/* + * XmlMemParser + * + */ + +class RT_DECL_CLASS XmlMemParser : public XmlParserBase +{ +public: + XmlMemParser(); + ~XmlMemParser(); + + void read(const void* pvBuf, size_t cbSize, const RTCString &strFilename, Document &doc); +}; + +/* + * XmlFileParser + * + */ + +class RT_DECL_CLASS XmlFileParser : public XmlParserBase +{ +public: + XmlFileParser(); + ~XmlFileParser(); + + void read(const RTCString &strFilename, Document &doc); + +private: + /* Obscure class data */ + struct Data; + struct Data *m; + + static int ReadCallback(void *aCtxt, char *aBuf, int aLen); + static int CloseCallback (void *aCtxt); +}; + +/** + * XmlMemWriter + */ +class RT_DECL_CLASS XmlMemWriter +{ +public: + XmlMemWriter(); + ~XmlMemWriter(); + + void write(const Document &doc, void** ppvBuf, size_t *pcbSize); + +private: + void* m_pBuf; +}; + + +/** + * XmlStringWriter - writes the XML to an RTCString instance. + */ +class RT_DECL_CLASS XmlStringWriter +{ +public: + XmlStringWriter(); + + int write(const Document &rDoc, RTCString *pStrDst); + +private: + static int WriteCallbackForSize(void *pvUser, const char *pachBuf, int cbToWrite); + static int WriteCallbackForReal(void *pvUser, const char *pachBuf, int cbToWrite); + static int CloseCallback(void *pvUser); + + /** Pointer to the destination string while we're in the write() call. */ + RTCString *m_pStrDst; + /** Set by WriteCallback if we cannot grow the destination string. */ + bool m_fOutOfMemory; +}; + + +/** + * XmlFileWriter + */ +class RT_DECL_CLASS XmlFileWriter +{ +public: + XmlFileWriter(Document &doc); + ~XmlFileWriter(); + + /** + * Writes the XML document to the specified file. + * + * @param pcszFilename The name of the output file. + * @param fSafe If @c true, some extra safety precautions will be + * taken when writing the file: + * -# The file is written with a '-tmp' suffix. + * -# It is flushed to disk after writing. + * -# Any original file is renamed to '-prev'. + * -# The '-tmp' file is then renamed to the + * specified name. + * -# The directory changes are flushed to disk. + * The suffixes are available via s_pszTmpSuff and + * s_pszPrevSuff. + */ + void write(const char *pcszFilename, bool fSafe); + + static int WriteCallback(void *aCtxt, const char *aBuf, int aLen); + static int CloseCallback(void *aCtxt); + + /** The suffix used by XmlFileWriter::write() for the temporary file. */ + static const char * const s_pszTmpSuff; + /** The suffix used by XmlFileWriter::write() for the previous (backup) file. */ + static const char * const s_pszPrevSuff; + +private: + void writeInternal(const char *pcszFilename, bool fSafe); + + /* Obscure class data */ + struct Data; + Data *m; +}; + +#if defined(_MSC_VER) +#pragma warning (default:4251) +#endif + +/** @} */ + +} // end namespace xml + +#endif /* !IPRT_INCLUDED_cpp_xml_h */ + |